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2013 年度 実績報告書

ハイブリッドプラズモンによる近接場ラマン顕微鏡の高感度高帯域化

研究課題

研究課題/領域番号 25286008
研究種目

基盤研究(B)

研究機関大阪大学

研究代表者

VERMA Prabhat  大阪大学, 工学(系)研究科(研究院), 教授 (60362662)

研究分担者 齊藤 結花  大阪大学, 工学(系)研究科(研究院), 准教授 (90373307)
研究期間 (年度) 2013-04-01 – 2016-03-31
キーワードナノプローブ / ナノマイクロ科学 / ナノ構造物理 / 近接場光学顕微鏡
研究概要

In this study, it is intended to develop an extremely sensitive near-field Raman microscope based on plasmon hybridization of two metallic nanostructures, namely a nano-tip and a nano-film. This research starts with theoretical optimization of the parameters involved in fabrication. In the first year of this project, we have achieved the following:
1. Optimization of metallic tip-film system:
We have performed 3D-FDTD simulations on the tip-film system. This was done for various parameters of the tip, such as the base material under the metal, the tip cone-angle, the tip-apex diameter etc., for the gap distance, and for the film roughness. As expected, the simulated scattering spectra show strong dependence on the film thickness.
2. Obtaining tunability in plasmon resonance:
In addition to the dependence on the film thickness, the plasmon resonance also shows dependence on the kind of metal. While the resonance for Ag varies from about 400 nm to 650 nm, it varies from about 600 nm to 900 nm for Au, confirming that we can tune the plasmon resonance anywhere in the visible spectrum.

現在までの達成度 (区分)
現在までの達成度 (区分)

2: おおむね順調に進展している

理由

The starting work in this research is to perform a 3D-FDTD simulation to optimize various parameters of the tip-film system. This is necessary in order to obtain the desired plasmon hybridization and to theoretically confirm the degree of confinement and enhancement as well as the tuning of the plasmon resonance. Once we successfully optimize the parameters by numerical simulation, the next step is to fabricate the same structures and examine them practically, and finally utilize them for highly sensitive optical nanoimaging. In this year, we have been successful in optimize various parameters and have theoretically obtained the tunability in plasmon resonance by calculating the absorption spectra for varying film thickness. This is an important result, utilizing which we can take up the next step in research.

今後の研究の推進方策

After optimization through theoretical simulation, we will move towards the fabrication. We will fabricate the plasmonic nano-tip by evaporating silver or gold on commercially available AFM cantilever, which is made of silicon. First, the cantilever will be oxidized under high temperature water-vapor, so that the base material becomes silicon-dioxide. Then the metal will be evaporated on this oxidized cantilever tip in ultra-high vacuum. In order to obtain high quality plasmon hybridization, it is necessary to have a very smooth metallic surface on the tip with surface roughness under 1-2 nm. We will optimize the evaporation parameters, such as the vacuum and the evaporation rate, to obtain the smooth surface. This will also be done for obtaining a very smooth metal film on a glass substrate. Both the tip and the film will be coated with an ultra thin layer of SiO2, so that the gap between the tip and the film can be maintained at a value that was optimized numerically in the first part. After successful fabrication, we will confirm functioning of the tip-film system and finally apply it in TERS measurements to study various samples and obtain nanoimaging, as planned.

次年度の研究費の使用計画

本年度(平成25年度)は、研究プロジェクト1年目で、研究のシュミレーションに時間を費やすことが多く、計算ソフトなどを購入し、実際の実験研究準備であったことと、2年目以降、本格的な実験設備に投資予定があるため繰り越した。
平成27年度以降、このプロジェクトが大きく進むため、高額な実験装置、備品購入を計画している。

  • 研究成果

    (10件)

すべて 2014 2013

すべて 雑誌論文 (4件) (うち査読あり 4件) 学会発表 (6件) (うち招待講演 6件)

  • [雑誌論文] Tip-enhanced Raman investigation of extremely localized semiconductor-to-metal transition of carbon nanotube2013

    • 著者名/発表者名
      Y. Okuno, Y. Saito, S. Kawata, and P. Verma
    • 雑誌名

      Phys. Rev. Lett.

      巻: 111 ページ: 216101

    • 査読あり
  • [雑誌論文] Tip-enhanced nano-Raman analytical imaging of locally-induced strain distribution in carbon nanotubes2013

    • 著者名/発表者名
      T. Yano, T. Ichimura, S. Kuwahara, F. H'Dhili, K. Uetsuki, Y. Okuno, P. Verma, and S. Kawata
    • 雑誌名

      Nature Commun

      巻: 4 ページ: 2592

    • 査読あり
  • [雑誌論文] Far-field free tapping-mode tip-enhanced Raman microscopy2013

    • 著者名/発表者名
      J. Yu, Y. Saito, T. Ichimura, S. Kawata and P. Verma
    • 雑誌名

      Appl. Phys. Lett.

      巻: 102 ページ: 123110

    • 査読あり
  • [雑誌論文] Evaluation of the interlayer interactions of few layers of graphene2013

    • 著者名/発表者名
      J. Tsurumi, Y. Saito and P. Verma
    • 雑誌名

      Chem. Phys. Lett.

      巻: 557 ページ: 114

    • 査読あり
  • [学会発表] Tip-enhanced Raman investigation of localized semiconductor-to-metal transition in carbon nanotubes2014

    • 著者名/発表者名
      Verma Prabhat
    • 学会等名
      The Third International Conference on Frontiers of Plasmonics
    • 発表場所
      Xiamen
    • 年月日
      20140326-20140401
    • 招待講演
  • [学会発表] Tip-enhanced Raman investigation of localized electronic properties in carbon nanotubes2014

    • 著者名/発表者名
      Verma Prabhat
    • 学会等名
      Japan-Taiwan Bilateral Conference: Biomedical and Plasmonic Imaging
    • 発表場所
      Taipei
    • 年月日
      20140225-20140226
    • 招待講演
  • [学会発表] Tip-enhanced Raman investigation of localized electronic properties in ‘X’-shaped carbon nanotubes2014

    • 著者名/発表者名
      Verma Prabhat
    • 学会等名
      International Symposium on Nanophotonics and Nanomaterials
    • 発表場所
      Beijing
    • 年月日
      20140116-20140117
    • 招待講演
  • [学会発表] Some improved techniques for better nanoimaging through tip-enhanced Raman scattering2013

    • 著者名/発表者名
      Verma Prabhat
    • 学会等名
      Nanoimaging and Nanospectroscopy, SPIE Optics + Photonics
    • 発表場所
      San Diego
    • 年月日
      20130825-20130829
    • 招待講演
  • [学会発表] Nanometric control on tip-sample separation for TERS and tip-enhanced fluorescence imaging2013

    • 著者名/発表者名
      Verma Prabhat
    • 学会等名
      TERS III - 3rd Meeting on Tip Enhanced Raman Spectroscopy
    • 発表場所
      Zurich
    • 年月日
      20130819-20130820
    • 招待講演
  • [学会発表] Tip-enhanced Fluorescence imaging with nanometric control on tip-sample separation2013

    • 著者名/発表者名
      Verma Prabhat
    • 学会等名
      The 9th Asia-Pacific Conference on Near-field Optics
    • 発表場所
      Singapore
    • 年月日
      20130703-20130706
    • 招待講演

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公開日: 2015-05-28  

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